MBE 4000 SERVICE MANUAL 6SE412
Problem—The Engine Exhaust Is Black
Cause
Remedy
The air filter and/or intake air system is clogged.
Check the air restriction indicator. Clean the intake air
system and replace the air filter if necessary.
The exhaust brake valve is malfunctioning.
Have an authorized dealer check the operation of the
valve.
The intake air preheater is malfunctioning.
Check that the heater is not staying on all of the time.
The valves are not adjusted properly.
Check the valve lash.
There is damage to the fuel system: the fuel pump, one
or more fuel injectors, or one or more unit pumps are
damaged.
Bring the vehicle to an authorized dealer for service.
The charge-air temperature sensor is damaged.
Bring the vehicle to an authorized dealer for service.
There is internal damage to the engine.
Bring the vehicle to an authorized dealer for service.
Problem—The Engine Exhaust Is Blue
Cause
Remedy
The engine oil level is too high (engine oil is reaching
the combustion chamber).
Adjust the oil level, and then have the oil level checked
by an authorized dealer.
The turbocharger is leaking oil.
Have an authorized dealer replace the turbocharger
The valve stem seals are loose or damaged.
Have an authorized dealer replace the seals.
The piston rings are worn.
Have an authorized dealer replace the piston rings.
Problem—Engine Brake Performance Is Poor
Cause
Remedy
The engine brake control switch is damaged.
Replace the switch
The exhaust brake is not operating properly.
Have an authorized dealer check the operation of the
valve.
The constant-throttle valves are malfunctioning.
Bring the vehicle to an authorized dealer for service.
Components of the PLD and/or VCU control unit are
damaged.
Bring the vehicle to an authorized dealer for service.
Problem—Cruise Control Is Not Working
Cause
Remedy
One or more of the cruise control switches are damaged.
Replace the damaged switch.
Components of the PLD and/or VCU control unit are
damaged or not working properly.
Bring the vehicle to an authorized dealer for service.
All information subject to change without notice.
(Rev. 2007)
6SE412 0702
Copyright © 2007 DETROIT DIESEL CORPORATION
From Bulletin 1–MBE 4000–07
16-9
